/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.tools.idea.assistant;

import com.intellij.util.messages.Topic;

/**
 * Notifier for underlying state of a button being updated. Does not pass the state as this is retrievable separately.
 */
public interface StatefulButtonNotifier {
  @Topic.ProjectLevel
  Topic<StatefulButtonNotifier> BUTTON_STATE_TOPIC = new Topic<>(StatefulButtonNotifier.class, Topic.BroadcastDirection.NONE);

  /**
   * Called when there is a signal that your underlying state for your
   * button may have changed.
   */
  void stateUpdated();

}
